CN116890943B - Railway cross rail AGV - Google Patents

Abstract

The utility model provides a railway track passing AGV, which belongs to the technical field of AGVs and comprises a vehicle body, wherein the length direction of the vehicle body is defined as the front-back direction; the lifting table is assembled on the vehicle body in a sliding manner along the up-down direction, a lifting mechanism for driving the lifting table to lift is arranged in the vehicle body, and the lifting mechanism lifts the accessory to be transported by driving the lifting table to lift so as to transport the accessory; the left side and the right side of the car body are respectively provided with a driving wheel, the inside of the car body is also provided with a driving motor for driving the driving wheels to rotate, the front side and the rear side of the driving wheels are respectively provided with driven wheels arranged on the car body, and the driving wheels are connected with the two driven wheels through tracks; according to the utility model, the problem that the AGV is blocked through the track can be solved by adopting the track structure, when the track is loose, the track can be tensioned by adjusting the distance between the driven wheel and the driving wheel, so that the stability of the AGV when the AGV passes through the track is ensured, and the service life of the track is prolonged.

Description

Railway cross rail AGV

Technical Field

The utility model relates to the technical field of AGVs, in particular to a railway track passing AGV.

Background

An AGV (automatic guided vehicle) is an industrial vehicle that automatically or manually loads a load, automatically travels or pulls a cargo truck to a designated place according to a set route, and then automatically or manually loads and unloads the load.

In the railway industry, a portion of the fittings are heavy, manual handling is laborious, and AGVs are used to address the transport of heavy line materials. And partial AGV delivery route need pass through railway track, and railway track has the recess, when the AGV bears heavier accessory (like the train wheel, the weight of train wheel is more than 300 kg), and the AGV is whole heavier, and the AGV is when passing through railway track this moment, and the wheel of AGV blocks into railway track's recess easily, needs manual intervention to lift the AGV dolly out, influences the normal transport of accessory.

In addition, when AGV passes through the track, because the influence of track recess, the automobile body can appear inclining and rock, if vibration or rock seriously, leads to the accessory offset too big, still can cause the accessory to drop, and the automobile body turns on one's side with the accessory together even, probably can harm AGV, and then leads to AGV's life to reduce.

The utility model patent with the publication number of CN219029593U discloses an AGV trolley and an AGV trolley system, when the scheme is driven under normal road conditions, a control system controls a wheel driving mechanism to keep in a working state, so that the wheel driving mechanism drives the AGV trolley to drive, after encountering an obstacle, the control system controls a track obstacle crossing mechanism to switch to the working state, so that the track obstacle crossing mechanism drives the AGV trolley to cross the obstacle, and after crossing the obstacle, the control system controls the wheel driving mechanism to switch to the working state, so that the wheel driving mechanism drives the AGV trolley to continue to drive.

The above-mentioned disclosed scheme has solved the problem that AGV passed over the recess through switching track obstacle crossing mechanism and passed over the obstacle, but similar crawler-type AGV still has some problems among this disclosed scheme and the prior art: AGVs for railways typically employ rubber tracks that can become loose after a period of use. After the track is loosened, the shaking of the AGV is more obvious when the AGV passes through the track, and the track may slip, so that the AGV needs to be replaced. However, we have found that the discarded tracks have substantially no other significant problems other than looseness and are simply discarded as being wasteful.

Disclosure of Invention

The utility model provides a railway track passing AGV, which aims to solve the technical problem of short track service period in the prior art.

In order to solve the problems, the railway track passing AGV provided by the utility model adopts the following technical scheme: comprises a vehicle body, wherein the length direction of the vehicle body is defined as the front-back direction;

the lifting table is assembled on the vehicle body in a sliding manner along the up-down direction, a lifting mechanism for driving the lifting table to lift is arranged in the vehicle body, and the lifting mechanism lifts the accessory to be transported by driving the lifting table to lift so as to transport the accessory;

the left side and the right side of the car body are respectively provided with a driving wheel, the inside of the car body is also provided with a driving motor for driving the driving wheels to rotate, the front side and the rear side of the driving wheels are respectively provided with driven wheels arranged on the car body, and the driving wheels are connected with the two driven wheels through tracks;

the driven wheel is arranged on a vehicle body through a tensioning mechanism, the distance between the driving wheel and the driven wheel is adjusted through the tensioning mechanism so that the crawler belt is kept tight, the tensioning mechanism comprises a connecting plate connected with the driven wheel, one side of the connecting plate, which is far away from the driven wheel, is connected with an adjusting block, the side wall of the vehicle body is connected with a mounting plate matched with the adjusting block, the mounting plate is provided with a rectangular groove, the adjusting block can slide in the rectangular groove along the front-back direction, the front end and the rear end of the mounting plate are respectively connected with a threaded rod in a threaded manner, the threaded rods extend into the rectangular groove, and the adjusting block is fixed through the two threaded rods;

the lifting table is further provided with a limiting mechanism for limiting the accessories, the limiting mechanism comprises a limiting block which is assembled on the lifting table in a sliding mode, and the limiting block is connected with the telescopic mechanism, so that the telescopic mechanism drives the limiting block to move to be in contact with the accessories, and the accessories are prevented from being deviated on the lifting table.

Through adopting above-mentioned technical scheme, not only can solve AGV and pass through the dead problem of track card, also can improve the utilization ratio of track simultaneously. The track can take place deformation after using a period, when the track, can appear obvious small-amplitude slope, although AGV also can pass through the track, the rocking that the slope appears can lead to the accessory skew, and follow-up if the road section of other obstacles or unevenness appears rocking again, then leads to the AGV unbalance to empty easily. This scheme sets up the intermediate position in automobile body both sides with the action wheel, sets up both sides around the action wheel with two follow driving wheels, when the track appears lax, through adjusting the interval between follow driving wheel and the action wheel, can rise tightly to the track, and then ensures the stability when AGV passes through the track, prolongs the life of track.

In addition, the structure that the driving wheel is positioned at the middle position and the two driven wheels are positioned at the two sides is adopted, so that the stability of the vehicle body can be improved. By adopting the structure, the two driven wheels are needed to be arranged in a staggered mode in the left-right direction, the wheel spacing on the left side and the right side of the AGV is increased, the stability of the vehicle body is improved, and the possibility of rollover of the AGV is further reduced.

As a further improvement, a plurality of rectangular holes are uniformly distributed on the connecting plate, and bolts are connected with the mounting plate through the rectangular holes so as to prevent the driven wheel from shifting.

By adopting the technical scheme, the driven wheel can be prevented from deviating. The driven wheel in this scheme adopts adjustable structure, consequently needs to guarantee to follow and can not appear relative displacement between driving wheel and the action wheel, and the regulating block passes through two threaded rod card fastening and fixes in the rectangular channel of mounting panel, sets up the rectangular hole on the connecting plate, further fixes the connecting plate through the bolt, dual protection is in order to prevent from the skew of driving wheel.

As a further improvement, a plurality of sliding grooves are formed in the bottom of the lifting table, a connecting rod is connected in the sliding grooves in a sliding mode, the telescopic mechanism is installed at one end, close to the center of the lifting table, of the connecting rod, one end, far away from the telescopic mechanism, of the connecting rod is connected with a limiting block, a hidden hole is formed in the upper portion of the sliding groove, and the limiting block penetrates through the hidden hole and extends to the upper portion of the lifting table so as to limit accessories.

By arranging the limiting mechanism, the offset condition of the accessory can be reduced.

As a further improvement, the limiting block is rotationally assembled on the connecting rod through a pin shaft, and the connecting rod is integrally formed with a stop block for limiting the limiting block, so that the limiting block cannot continue to rotate after rotating to be vertical to the connecting rod, and a torsion spring is arranged on the pin shaft of the limiting block and keeps vertical to the connecting rod in a normal state;

the limiting block is provided with a working position and a hiding position on the sliding stroke, and the limiting block at the working position is vertical to the connecting rod so as to be attached to the accessory to limit the accessory; the limiting block at the hidden position is extruded and contracted to the inside of the chute by the top of the chute so as to hide the limiting block.

After setting up stop gear, though can solve the problem of accessory skew, but bellied stopper also produces other restrictions, for example, does not set up stop gear's condition, but AGV transfer area is greater than the accessory of automobile body, because the influence of stopper after setting up stop gear, can reduce AGV's adaptability. Therefore, the hidden limiting mechanism is adopted in the scheme, and when the hidden limiting mechanism is not used, the limiting block is hidden, so that other accessories with larger areas are prevented from being influenced.

As a further improvement, the inside of the limiting block is of a hollow structure, a locking block is slidably assembled on one side, close to the center of the lifting table, of the limiting block, an elastic telescopic rod is arranged in the limiting block, and the elastic telescopic rod is connected with the locking block;

the locking piece has toper or wedge structure, and the inside of stopper is equipped with the locking baffle of installing in locking piece both sides, and locking baffle sliding assembly is inside the stopper, is connected with the spring between locking baffle and the stopper inner wall, still is equipped with the locking axle on the locking baffle, and the both sides of hiding the hole are equipped with and lock axle complex locking hole for when locking piece shrink, two locking baffle make two locking baffle separation, and then make the locking axle card go into the locking hole, in order to prevent the stopper skew.

By adopting the technical scheme, the damage of the telescopic mechanism can be reduced. The telescopic machanism generally selects the electronic telescopic machanism of small, and the accessory that AGV transported is heavy in most, once the appearance rocks, and stopper atress is great, and the stopper appears the skew if being impacted, damage telescopic machanism very easily. Through setting up the locking piece on the stopper, when stopper and accessory subsides, inside the locking piece shrink to the stopper, because the locking piece has toper or wedge structure, promote the locking stop plate and remove, make the locking axial outwards remove and block into corresponding locking downthehole, even the accessory strikes the stopper this moment, because the spacing of locking axle, the stopper can't remove, avoids damaging telescopic machanism. After the accessory is taken down, the locking block and the locking shaft are reset, and the locking of the limiting block can be released.

As a further improvement, four corners of the top of the vehicle body are provided with bearing blocks for supporting four corners of the lifting table.

The bearing block can support four corners of the lifting platform on one hand, and on the other hand, gaps can be reserved between the lifting platform and the vehicle body, so that the telescopic mechanism is convenient to install, and damage to the telescopic mechanism is avoided.

As a further improvement, the bottom of the vehicle body is also provided with a plurality of universal wheels so as to improve the stability of the vehicle body.

The technical scheme of the utility model has the following beneficial effects:

1. through adopting the track structure, can solve AGV and pass through the dead problem of track card, in this scheme, the action wheel sets up the intermediate position in automobile body both sides, with two from the front and back both sides of driving wheel setting, when the track appears lax, through adjusting from the interval between driving wheel and the action wheel, can rise tightly to the track, and then ensures the stability when AGV passes through the track, the life of extension track.

2. Through setting up stop gear, can reduce the circumstances of accessory skew, and stop gear's stopper can hide in the lift platform, when not using, hide the stopper, avoid influencing and transport other some accessories that area is great.

3. The stopper still is equipped with locking structure, when stopper and accessory subsides, the stopper automatic locking, even the accessory strikes the stopper like this, because the spacing of locking axle, the stopper can't remove, avoids damaging telescopic machanism, has improved the stability of stopper and telescopic machanism's life.

Drawings

The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:

FIG. 1 is a perspective view of an railway track passing AGV of the present utility model;

FIG. 2 is a front view of the railway track passing AGV of the present utility model;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

FIG. 4 is a cross-sectional view B-B of FIG. 2;

FIG. 5 is a top view of the railway track passing AGV of the present utility model;

FIG. 6 is a schematic view of the stop mechanism of the present utility model in a hidden position for a railway track passing AGV;

FIG. 7 is a schematic view of the stop mechanism of the present utility model in the operative position for a railway track passing AGV;

FIG. 8 is a schematic view of the stop block of the rail transit AGV of the present utility model;

fig. 9 is a C-C cross-sectional view of fig. 8.

Reference numerals illustrate:

1. a vehicle body; 2. a lifting table; 3. a driving wheel; 4. driven wheel; 5. a track; 6. a tensioning mechanism; 601. a mounting plate; 602. a threaded rod; 603. an adjusting block; 604. a connecting plate; 605. a rectangular hole; 7. a limiting mechanism; 701. hiding the hole; 702. a locking hole; 703. a chute; 704. a connecting rod; 705. a limiting block; 7051. a locking block; 7052. a locking baffle; 7053. an elastic telescopic rod; 7054. a spring; 7055. a locking shaft; 706. a torsion spring; 707. a stop block; 708. a slide rail; 8. a universal wheel; 9. and a bearing block.

Detailed Description

The following description of the embodiments of the present utility model will be made more complete and clear to those skilled in the art by reference to the figures of the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the prior art, when the AGV passes through the track, the shaking amplitude is large, and the problem that wheels are blocked easily occurs, so that the problem that the track structure is used on the AGV, but the track loosens after a period of use, is solved. After the track is loosened, the shaking of the AGV is more obvious when the AGV passes through the track, and the track may slip, so that the AGV needs to be replaced. The track has shorter service life and is wasted. In addition, although track structure is in the stability of crossing the rail, obstacle such as crossing better, still exists the condition that the automobile body inclines and rocks, when transporting some heavier accessories, the accessory if the skew range is too big, still can turn on one's side along with the AGV, damage AGV dolly.

With regard to the above-mentioned problem, this scheme sets up the intermediate position in automobile body both sides with the action wheel, sets up two from the driving wheel in the front and back both sides of action wheel, when the track appears lax, through adjusting the interval between follow driving wheel and the action wheel, can rise tightly to the track, and then ensures the stability when AGV passes through the track, prolongs the life of track. Specifically during operation, can rotate the threaded rod earlier, adjust the position of regulating block through two threaded rods, make the track keep tight, after preliminary fixed, rethread bolt will connecting plate and mounting panel fixed connection, ensure the problem of not hard up skew can not appear from the driving wheel.

In order to prevent the accessory skew, still set up stop gear and spacing to the accessory, set up stop gear after, although can solve the problem of accessory skew, but bellied stopper also produces other restrictions, for example, does not set up stop gear's condition, but AGV transfer area is greater than the accessory of automobile body, because the influence of stopper after setting up stop gear, can reduce AGV's adaptability. Therefore, the hidden limiting mechanism is adopted in the scheme, and when the hidden limiting mechanism is not used, the limiting block is hidden, so that other accessories with larger areas are prevented from being influenced.

The limiting mechanism comprises a sliding groove formed in the bottom of the lifting table, and a gap is formed between the connecting rod and the top of the sliding groove so as to accommodate the limiting block. When the accessory is required to be limited, the connecting rod pulls the limiting block to enable the limiting block to move to the central position of the lifting table, when the limiting block moves to the hidden hole, the limiting block is not limited by the top of the sliding groove, and the torsion spring drives the limiting block to rotate, so that the limiting block is kept vertical until the limiting block moves to be in contact with the accessory.

When stopper and accessory subsides, inside the locking piece shrink to the stopper, owing to the locking piece has toper or wedge structure, promote the locking stop plate and remove, make the locking axial outside remove and block into corresponding locking downthehole, even the accessory strikes the stopper this moment, owing to the spacing of locking axle, the stopper can't remove, avoids damaging telescopic machanism.

Having described the basic principles of the present utility model, various non-limiting embodiments of the utility model are described in detail below. Any number of elements in the figures are for illustration and not limitation, and any naming is used for distinction only and not for any limiting sense.

The principles and spirit of the present utility model are explained in detail below with reference to several representative embodiments thereof.

Example 1 of a railway over-rail AGV provided by the utility model:

as shown in fig. 1 to 9, the vehicle body 1 is included, and the longitudinal direction of the vehicle body 1 is defined as the front-rear direction; the top of the car body 1 is provided with a lifting table 2 which is assembled on the car body 1 in a sliding way along the up-down direction, the inside of the car body 1 is provided with a lifting mechanism for driving the lifting table 2 to lift, and the lifting mechanism lifts the accessory to be transferred by driving the lifting table 2 so as to transfer the accessory. The above are all prior art and are not described in detail herein.

As shown in fig. 1, driving wheels 3 are installed on the left and right sides of the vehicle body 1, a driving motor for driving the driving wheels 3 to rotate is also installed in the vehicle body 1, in this embodiment, the driving motor is a servo motor, the servo motor is provided with two driving wheels 3 to rotate respectively, driven wheels 4 installed on the vehicle body 1 are arranged on the front and rear sides of the driving wheels 3, the driving wheels 3 are connected with the two driven wheels 4 through a crawler belt 5, as shown in fig. 2, the two driven wheels 4 are arranged in a staggered manner in the left and right direction, the wheel spacing of the left and right sides of the AGV is increased, the stability of the vehicle body 1 is improved, and the possibility of rollover of the AGV is further reduced.

As shown in fig. 3 and 4, the driven wheel 4 is mounted on the vehicle body 1 through a tensioning mechanism 6, the distance between the driving wheel 3 and the driven wheel 4 is adjusted through the tensioning mechanism 6 so that the crawler belt 5 is kept tight, the tensioning mechanism 6 comprises a connecting plate 604 connected with the driven wheel 4, one side of the connecting plate 604, which is far away from the driven wheel 4, is connected with an adjusting block 603, the side wall of the vehicle body 1 is connected with a mounting plate 601 matched with the adjusting block 603, the mounting plate 601 is provided with a rectangular groove, the adjusting block 603 can slide in the rectangular groove along the front-back direction, the front end and the back end of the mounting plate 601 are respectively connected with a threaded rod 602, the threaded rods 602 extend into the rectangular groove, the adjusting block 603 is fixed through the two threaded rods 602, blind holes corresponding to the threaded rods 602 can be formed on two sides of the adjusting block 603, and the threaded rods 602 are positioned so as to ensure that the threaded rods 602 are kept horizontal;

a plurality of rectangular holes 605 are uniformly distributed on the connecting plate 604, two sides of the rectangular holes 605 are arc-shaped, and bolts are connected with the mounting plate 601 through the rectangular holes 605 to prevent the driven wheel 4 from shifting. When the crawler belt 5 is adjusted, the bolts in the rectangular holes 605 are loosened, the disassembly is not needed, and when the crawler belt 5 is adjusted and tightened, the bolts are screwed down again, and the connecting plate 604 is fixed.

Specifically, during operation, the threaded rod 602 can be rotated first, the positions of the adjusting blocks 603 are adjusted through the two threaded rods 602, the crawler belt 5 is kept tight, the connecting plate 604 is fixedly connected with the mounting plate 601 through the bolts after preliminary fixing, and the problem that the driven wheel 4 cannot loose and deviate is solved.

As shown in fig. 1, 5, 6 and 7, the lifting table 2 is further provided with a limiting mechanism 7 for limiting the accessory, the limiting mechanism 7 includes a limiting block 705 slidably mounted on the lifting table 2, the limiting block 705 is connected with a telescopic mechanism (not shown in the drawings, the telescopic mechanism is mounted at the bottom of the lifting table 2, and a mounting space is reserved at the bottom of the lifting table 2), in this embodiment, the telescopic mechanism is an electric telescopic rod, so that the telescopic mechanism drives the limiting block 705 to move to contact with the accessory to prevent the accessory from shifting on the lifting table 2.

In this embodiment, four sliding grooves 703 are formed in the bottom of the lifting platform 2, sliding rails 708 matched with the connecting rods 704 are arranged in the sliding grooves 703, the connecting rods 704 are connected in a sliding manner in the sliding grooves 703, the telescopic mechanism is installed at one end, close to the center of the lifting platform 2, of the connecting rods 704, one end, far away from the telescopic mechanism, of the connecting rods 704 is connected with a limiting block 705, a hiding hole 701 is formed in the upper portion of the sliding grooves 703, the length of the hiding hole 701 is slightly smaller than the telescopic travel of an electric telescopic rod, and the limiting block 705 penetrates through the hiding hole 701 to extend to the upper portion of the lifting platform 2 so as to limit accessories.

The limiting block 705 is rotationally assembled on the connecting rod 704 through a pin shaft, a stop block 707 for limiting the limiting block 705 is integrally formed on the connecting rod 704, so that the limiting block 705 cannot continuously rotate after rotating to be perpendicular to the connecting rod 704, a torsion spring 706 is arranged on the pin shaft of the limiting block 705, the limiting block 705 is kept perpendicular to the connecting rod 704 in a normal state by the torsion spring 706, and in other embodiments, other elastic pieces can be used for replacing the torsion spring 706;

as shown in fig. 6 and 7, the limiting block 705 has a working position and a hiding position on a sliding stroke, and the limiting block 705 in the working position is vertical to the connecting rod 704 so as to be attached to the accessory to limit the accessory; the limiting block 705 in the hidden position is extruded and contracted to the inside of the sliding groove 703 by the top of the sliding groove 703 so as to hide the limiting block 705.

After setting up stop gear 7, though can solve the problem of accessory skew, but bellied stopper 705 also produces other restrictions, for example, does not set up stop gear 7 under the circumstances, but AGV transfer area is greater than automobile body 1's accessory, because the influence of stopper 705 after setting up stop gear 7, can reduce AGV's adaptability. Therefore, the hidden limiting mechanism 7 is adopted in the scheme, and when the hidden limiting mechanism is not used, the limiting block 705 is hidden, so that other accessories with larger areas are prevented from being influenced.

As shown in fig. 8 and 9, the inside of the limiting block 705 is a hollow structure, a locking block 7051 is slidably mounted on one side of the limiting block 705 near the center of the lifting platform 2, an elastic telescopic rod 7053 is mounted inside the limiting block 705, the elastic telescopic rod 7053 is connected with the locking block 7051, and the elastic telescopic rod 7053 is used for helping the locking block 7051 to reset and has a certain guiding function;

the locking block 7051 has a conical structure, the inside of the limiting block 705 is provided with locking stop plates 7052 arranged on two sides of the locking block 7051, the locking stop plates 7052 are slidably assembled inside the limiting block 705, a spring 7054 is connected between the locking stop plates 7052 and the inner wall of the limiting block 705, the locking stop plates 7052 are further provided with locking shafts 7055, two sides of the hidden hole 701 are provided with locking holes 702 matched with the locking shafts 7055, when the locking block 7051 is contracted, the two locking stop plates 7052 are extruded to separate the two locking stop plates 7052, and then the locking shafts 7055 are clamped into the locking holes 702 to prevent the limiting block 705 from shifting.

When the fitting is removed, the lock block 7051 and the lock shaft 7055 are reset, and the lock of the stopper 705 can be released.

Example 2 of a railway over-rail AGV provided by the utility model:

the differences from example 1 are mainly that:

in this embodiment, the four corners of the top of the vehicle body 1 are provided with bearing blocks 9 to support the four corners of the lifting table 2. The bearing blocks 9 can support four corners of the lifting table 2 on one hand, and can reserve gaps between the lifting table 2 and the vehicle body 1 on the other hand, so that the telescopic mechanism is convenient to install and is prevented from being damaged.

Example 3 of the railway over-rail AGV provided by the utility model:

the differences from example 1 are mainly that:

in this embodiment, two universal wheels 8 are further provided at the bottom of the vehicle body 1 to improve the stability of the vehicle body 1, and the two universal wheels 8 are disposed along the diagonal line of the vehicle body 1.

While various embodiments of the present utility model have been shown and described herein, it will be obvious to those skilled in the art that such embodiments are provided by way of example only. Many modifications, changes, and substitutions will now occur to those skilled in the art without departing from the spirit and scope of the utility model. It should be understood that various alternatives to the embodiments of the utility model described herein may be employed in practicing the utility model. The appended claims are intended to define the scope of the utility model and are therefore to cover all module forms, equivalents, or alternatives falling within the scope of the claims.

Claims (5)

1. A railway over-track AGV comprising:

a vehicle body (1) defining a longitudinal direction of the vehicle body (1) as a front-rear direction;

the lifting table (2) is assembled on the vehicle body (1) in a sliding manner along the up-down direction, a lifting mechanism for driving the lifting table (2) to lift is arranged in the vehicle body (1), and the lifting mechanism lifts the accessory to be transported by driving the lifting table (2) to lift so as to transport the accessory;

the vehicle is characterized in that driving wheels (3) are arranged on the left side and the right side of the vehicle body (1), a driving motor for driving the driving wheels (3) to rotate is also arranged in the vehicle body (1), driven wheels (4) arranged on the vehicle body (1) are arranged on the front side and the rear side of the driving wheels (3), and the driving wheels (3) are connected with the two driven wheels (4) through crawler belts (5);

the driven wheel (4) is arranged on the vehicle body (1) through a tensioning mechanism (6), the distance between the driving wheel (3) and the driven wheel (4) is adjusted through the tensioning mechanism (6) so that the crawler belt (5) is kept tight, the tensioning mechanism (6) comprises a connecting plate (604) connected with the driven wheel (4), one side, far away from the driven wheel (4), of the connecting plate (604) is connected with an adjusting block (603), the side wall of the vehicle body (1) is connected with a mounting plate (601) matched with the adjusting block (603), the mounting plate (601) is provided with a rectangular groove, the adjusting block (603) can slide in the rectangular groove along the front-back direction, threaded rods (602) are connected to the front end and the back end of the mounting plate (601) in a threaded mode, and the threaded rods (602) extend into the rectangular groove so that the adjusting block (603) can be fixed through the two threaded rods (602);

the lifting table (2) is also provided with a limiting mechanism (7) for limiting accessories, the limiting mechanism (7) comprises a limiting block (705) which is assembled on the lifting table (2) in a sliding manner, and the limiting block (705) is connected with the telescopic mechanism, so that the telescopic mechanism drives the limiting block (705) to move to be in contact with the accessories, and the accessories are prevented from being deviated on the lifting table (2); a plurality of rectangular holes (605) are uniformly distributed on the connecting plate (604), and bolts are connected with the mounting plate (601) through the rectangular holes (605) so as to prevent the driven wheel (4) from shifting; a plurality of spouts (703) have been seted up to lift platform (2) bottom, and sliding connection has connecting rod (704) in spout (703), telescopic machanism installs the one end that is close to lift platform (2) central authorities at connecting rod (704), one end that telescopic machanism was kept away from to connecting rod (704) is connected with stopper (705), hidden hole (701) have been seted up to spout (703) top, stopper (705) pass hidden hole (701) and extend to lift platform (2) top in order to spacing to the accessory.

2. The railway track-passing AGV of claim 1 wherein: the limiting block (705) is rotationally assembled on the connecting rod (704) through a pin shaft, a stop block (707) for limiting the limiting block (705) is integrally formed on the connecting rod (704), so that the limiting block (705) cannot continue to rotate after rotating to be perpendicular to the connecting rod (704), a torsion spring (706) is arranged on the pin shaft of the limiting block (705), and the torsion spring (706) keeps perpendicular to the connecting rod (704) under normal conditions;

the limiting block (705) is provided with a working position and a hiding position on the sliding stroke, and the limiting block (705) at the working position is vertical to the connecting rod (704) so as to be attached to the accessory to limit the accessory; the limiting block (705) at the hidden position is extruded and contracted to the inside of the sliding groove (703) by the top of the sliding groove (703) so as to hide the limiting block (705).

3. The railway over-the-track AGV of claim 2 wherein: the inside of the limiting block (705) is of a hollow structure, a locking block (7051) is slidably assembled on one side, close to the center of the lifting table (2), of the limiting block (705), an elastic telescopic rod (7053) is arranged in the limiting block (705), and the elastic telescopic rod (7053) is connected with the locking block (7051);

the locking block (7051) is of a conical or wedge-shaped structure, locking baffles (7052) mounted on two sides of the locking block (7051) are arranged in the limiting block (705), the locking baffles (7052) are slidably assembled in the limiting block (705), springs (7054) are connected between the locking baffles (7052) and the inner wall of the limiting block (705), locking shafts (7055) are further arranged on the locking baffles (7052), locking holes (702) matched with the locking shafts (7055) are formed in two sides of the hidden holes (701), when the locking block (7051) is contracted, the two locking baffles (7052) are extruded to enable the two locking baffles (7052) to be separated, and then the locking shafts (7055) are clamped into the locking holes (702) to prevent the limiting block (705) from shifting.

4. The railway track-passing AGV of any one of claims 1 to 3 wherein: bearing blocks (9) are arranged at four corners of the top of the car body (1) so as to support four corners of the lifting table (2).

5. The railway track-passing AGV of any one of claims 1 to 3 wherein: the bottom of the car body (1) is also provided with a plurality of universal wheels (8) so as to improve the stability of the car body (1).